Separable piston



1,523,581 B. G. CAMPBELL Jan, 20, 1925.

SEPARABIJE PISTON Filed May 9 1923 /N\/EA/TOR BEN 6 0A MPBELL @MMZ/ Patented Jan. 20, 1925. 2

UNITED STATES BEN G. CAMPBELL, OF FRESNO, CALIFORNIA.

SEPARABLE PIS'IO'N.

Application filed May 9,

T all whom it may concern:

Be it known that I, BEN G. CAMPBELL,

' a citizen of the United States, and resident form comprises a of Fresno, in the county of Fresno, State of California, have invented certain new and useful Improvements in separable Pistons,'of which the following is a specification.

My invention relates primarily to pistons used in explosion engines and the like having packing 'rings.

Heretofore, in explosion engines, when it has been desired to replace the piston rings for any reason it has been necessary to dis mantle the engine and disconnect the connecting rods from the cranks, and remove the piston and connecting rod, which necessitated considerable labor and inconvenience as well as the expenditure of considerable time.

It is the object of my invention to provide a separable iston so constructed and arranged as to e easily and quickl detached from or replaced in its position 0 use.

Another object is to provide in a piston of the above character means whereby the portion thereof in which the rings are mounted may be easily and quickly separated or detached from the remainderfof the piston for removal from the cylinder.

Other objects and advantageswill appear hereinafter, and, while I have shown and will describe the preferred form of my invention, I wish it understood that I do not limit myself to such preferred form but that various chan' es and adaptations may be made therein without departing from the spirit of my invention.

In the drawings accompanying and forming a part hereof Fig. 1 is a central longitudinal section through a piston constructed according to my preferred; form.

Fig. 2 is a top planof Fig. 1.

Fig. 3 is an enlarged fragmentary detail of a modified form.

Fig. 4 is a central longitudinal section of another formof my devlce.

Fig. 5 is a similar view to Fig. 4 taken at right angles thereto.

Fig. 6 is a topplan, partly in section, of Fig. 4.

Referring tothe drawings, my preferred iston body composed of two parts, the skint portion 8. and the rilgg portion 9. The skirt portion 8 is prov-Id 1923. Serial No. 637,719.

with the usual wrist pin bearings 10 and the ring portion 9 is provided with the usual ring grooves 11. Provided around the upper edge. of skirt portion 8 is an upstanding annular flange 12 the outer edge of which lies flush with the outer wall of skirt portion 8, and provided around the lower edge of ring portion 9 is a downwardly extending flange 13 which is of a size and configuration to snugly fit within the annular flange 12 of skirt portion 8, forming .a substantially tight dovetail connection therebetween. Extending upwardly from the top of bearings 10, about centrally of their length, are bosses 14 and 15, and mounted at one end in bosses 14 and. 15, in screwthreaded engagement therewith, arestuds l6 and 17. Pins 18 and 19, passing through-bosses 14 and 15 and the lower ends of studs 16 and 17, hold the same securely positioned against displacement. Studs 16 and 17 extend upwardly from bosses 14 and 15 and pass through apertures 20 and 21 in the top wall of ring portion 9. Provided in the top wall of ring portion 9, to open outwardly, and concentric with apertures 20 and 21, are recesses 22 and 23 in which are mounted nuts 24 and 25in screwthreaded engagement with the upper ends of studs 16 and 17. Nuts 24 and 25 are provided with slots 26 and 27 by means of which the same may be rotated. Provided centrally of the top wall,of ring ,portion 9, to extend partially therethrough, is a screwthreaded aperture 28' in which is positioned a tool, not shown, for removing or replacing the ring portion 9 of the pis ton from or to the cylinder.

In Fig. 3 the contruction of my device is substantially the same as in Figs. 1 and 2, with the exception that a screwthreaded connection is provided between flanges 12 and 13 in lieu of the studs 16 and 17 and portion 31 and the ring portion 32, divided transversely on a line passing centrally through thewrist pin bearings 33 and 34* and being provided with a dovetail connection 35. The lower portions of bearings 33 and 34 are carried by the skirt portion 31, and the upper portions'of bearings 33 and 34 are carried by the ring portion 32. Extending outwardly from the sides of bearings 33 and 34 are cats 36 and 37, ears 36 being carried by the skirt portion 31 of the piston and being screwthreaded, and ears 37 being carried by the ring portion 32 and bein provided with apertures 38 through whic pass the lower ends of bolts 39 and 40 the lower ends of which are in screwthreaded engagement with ears 36. Bolts 39 and 40 extend upwardly, pass through apertures 41 and 42 in the top wall of ring portion 32 and terminate in round heads43 and 44 mounted within-recesses 45 in the top wall of ring portion32. Heads 43 and 44 are provided with slots 46 for the reception of a suitable tool for positioning said bolts. Provided centrally of the top wall of ring portion 32 is a screwthreaded aperture 47 for the rece tion of asuitable tool for handling the piston during its removal and replacement from and to the cylinder.

In the operation of mydevice the parts will normally be inthe positions shown when in their operative positions. 'When it is desired to replace the rings, the nuts 24: and will be removed by means of a screw driver or other suitable tool.. A suitable tool will then be inserted in aperture 28 and the ring portion S) may then be cylinder. lhe replacement of'portion 9 will be carried on in a reverse order from the foregoing.

Having described my invention, claim is:

A separable piston comprising a head por-' tion and a skirt portion; a flange extending upwardly around the upper edge of said skirt portion; a flange depending down- What I wardly around the lower edge of said head portion adapted to fit snugly within the flange of the skirt portion; a ,pair of opposed hearings in said skirt portion: a boss extending upwardly from each of said bearings; a stud rigidly. secured :at its lower end in each of said bosses to extend upwardly; apertures in the top wall of said head portion through which said studs pass; a recess in the outer face of said top wallconcentric with the apertures therein; and a nut for 50 said studs mounted in each of said recesses in threaded engagement with said studs.

In witness that I claim the foregoing I havehereunto set my hand this 4th day of April, 1923. p

' BEN G. CAMPBELL.

withdrawn from the 30 

